71 Measuring and Viewing

Overview of Running a Session

CHAPTER

5

Measuring and Viewing

Once you have setup your logging parameters and calibrated the instrument, you are ready to begin measuring. The focus of this chapter is to give you a brief overview of what is measured, how to navigate, what measurements screens will appear, and how to run and stop your measurements. The chapter concludes with an explanation of the file system management functionality which is comprised of the following: reviewing past measurements, deleting files, viewing file storage and memory, and viewing the estimated run-time.

 NOTE: The subsequent sections show examples of views which you may have disabled on your

instrument (refer to Chapter 3 , “Setting-up the EVM” for more details).

Overview of Running a Session

The list below is a brief overview of the steps for running a study.

Quick Help

Quick Help List: typical gas/particulate/air quality overview

1.

Turn the EVM on and check your battery power (see Chapter 2).

2.

Reset/Clear memory (if necessary). o This will clear out all of the data history before your study begins to ensure you have sufficient memory space.

3.

Set-up your study parameters (see Chapter 3).

4.

Calibrate each sensor/parameter (see Chapter 4).

5.

Place the EVM in a specific location for area monitoring.

6.

Press the Run/Stop key to start the study (see Chapter 5)

7.

When you are ready to end your study, press the Run/Stop key to stop the study.

8.

Review your results either on the instrument or download to DMS for further analysis (graphs/charts, saving and printing).

Figure 5-1: Quick help list for running a study

Measuring

Once you have placed the Environmental Monitor (EVM) in a specific location, you are ready to take measurements.

With a couple pushes on the keypad buttons, you will be running and viewing your sessions. Following your sessions you can load the data/files into DMS to manipulate, analyze, save, and create reports

(See Chapter 6 for viewing your logged data in DMS).

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72 Measuring

Understanding What Data is Stored

Understanding What Data is Stored

When you are performing air quality monitoring, there are two types of data stored in the instrument which includes summary data and time history data (or logged data).

Summary Data

Summary data represents values that occurred over the entire run of the study. An average measurement is the average of all arithmetic data points for a sensor (i.e., dust, humidity, CO, etc..),

Max and Min values are the highest and lowest measurements that occurred throughout the run time.

Figure 5-2: Sample summary data from a DMS table

Logged Data/Time History

Logged data, also referred to as “time history,” plots measurements with a specified logging interval ranging from 1 second intervals to 60 minute intervals (as set up in the EVM monitors via the logging screen).

Time History data represents measurements that occurred over the most recent time period, which is the logging interval. For example, if the log interval is 1 minute, then the maximum value is the highest value for that 1 minute, and the Lavg value is the average value for that 1 minute.

 NOTE: DMS has two default logged data charts that appear: temperature and humidity on the first logged chart, and Dust and CO

2

data on the second logged data chart. (If you do not have those sensors installed, they will not appear.) In DMS, to view different sensor measurement parameters on the logged data chart, click on the the specific sensors’ checkboxes.

and click in

EVM Series User Manual

73 Measuring

Running and Stopping

Particulates

Will display max. and low peaks in logged data chart.

CO

2

data

Figure 5-3: Sample time history data (or logged data) chart

Running and Stopping

When running a session, the pump will automatically turn on during your logging/run if particulate is enabled. (This is explained in the Particulate setup section.) At any time, you can turn the pump off

(disable) if you are not measuring particulates or the environment is extremely dirty and you want to keep the pump clean. Simply press the particulate key (as indicated in Figure 2-2) to turn this feature off. To page through the measurement screens, press ◄ / ► Arrows .

 NOTE:

For particulates ensure the impactor is well-greased before measuring (see “ Impactor Care ”

for details).

 Running and Stopping measurements

1.

From the start screen or any of the measurement screens, press the Run/Stop key to begin measuring.

 A 5 second countdown will appear with a run message (in pause mode) when the particulate setting is enabled.

2.

Press and hold the Run/Stop key to stop measuring.

Run mode

Level values for each sensor

 Shortcut : Press Enter key to toggle through different measurement units.

Figure 5-4: Composite measurement screen in run mode

EVM Series User Manual